[TOMT][MOVIE][2000s] Horror Movie About a Drowned Ghost Girl
I just saw the end of a horror movie from 2008 (I think), so I know the details of the last scene but I don't know anything else. In the last scene, a girl (the main character?) goes to the gravesite of her dead friend who drowned in her car after driving into a lake. She pulls up the headstone and realizes that the grave is fake. She calls her friend who just got to Taiwan, and the friend reveals that SHE'S the one who murdered the girl because they were both sleeping with the same teacher.
We see some flashbacks as she explains what happened, and it looks like the movie had a villain with some kind of bird-beak mask who stalked them. I think the teacher had just gotten killed because everyone thought he was the one in the mask. But the girl in Taiwan reveals that she was behind everything, including her friend's drowning. She thinks she's getting away with it, but as she starts her car in her garage, the ghost of the drowned girl appears and fills the car with exhaust fumes, killing her.
I hope this description makes sense. Can someone tell me the name of this movie? It doesn't look great (and it's very low-budget), but this last scene got me curious.